Converter In-Rush Thermistors etc, UPDATE -4
UPDATE on 17 Nov, Update 2 on 22 Nov, Update 3 on 16 Jan 14, Update 4 on 19 Oct 14. --------------- In a recent thread there was mention of how you can wreck your gizmo (in my case a converter) ...
Forum Discussion
Salvo wrote:
I took a look at my Progressive 45A converter. I have a 2 ohm, 18A thermistor. What's interesting is that the thermistor is tied to the heat sink of the input diode bridge. There are two possibilities for this:
1. It guarantees the device remains HOT while the converter is in operation. Hot means lower thermistor resistance and less heat dissipation.
2. The device gets too hot when standing along. It need a heat sink. As I mentioned before it could be the continuous 8W (or more) power dissipation that is stressing the part.
While doing battery resistance testing in the past, I've cycled this converter many times in succession with no failures.
Sal
I guess it depends on the heatsink, but normally they're designed to keep the things cool that are attached to them - not normally what you'd want to do in this application.
